RichThesaurus
swear to
swear to
synonyms
affirm
corroborate
certify
prove
guarantee
substantiate
declare
assert
attest to
testify to
verify
warrant
support
confirm
asseverate
swear up and down
vow
bear out
swear
argue
sign for
promise
give credence to
be responsible for
say so
vouch for
throw one's weight behind
evince
maintain
pledge
back up
answer for
demonstrate
profess
avow
assure
witness
give one’s word
stand up for
announce
endorse
stick up for
attest
bear witness to
testify
aver
show
uphold
tell
vow to
more synonyms
swear to
antonyms
reject
disavow
disagree
refute
disprove
deny
renounce
break off